Large-size sheet local heating forming device

Abstract

This invention discloses a large-size sheet metal local heating and forming device, including a heating module and a material gripping module. The material gripping module grips the sheet metal and moves it to the heating module for local heating. The device also includes a correction module connected to the heating module. The correction module includes a first correction branch and a second correction branch. When the heating module moves along the length of the sheet metal towards the position on the sheet metal to be heated, the first correction branch corrects the length of the sheet metal to be parallel to the moving direction of the heating module, and the second correction branch corrects the width of the sheet metal to be flush with the horizontal plane.

Description

Technical Field

[0001] This invention relates to the field of metal sheet heating technology, specifically to a device for local heating and forming of large-size sheet metal. Background Technology

[0002] It is well known that metal sheets are easier to shape when extruded after heating. However, some metal sheets only need to be extruded locally. Therefore, it is necessary to heat the parts of the metal sheet that need to be extruded. The commonly used heating method is medium-frequency induction heating, which involves placing an inductor on the part of the sheet that needs to be heated. When the inductor is working, it generates an alternating magnetic field, which in turn generates an induced current of the same frequency in the workpiece. The induced current is unevenly distributed on the workpiece, being strong on the surface and very weak in the interior. By utilizing this skin effect, the workpiece can be heated rapidly.

[0003] The shortcoming of the existing technology is that when local heating of metal sheets, a gripping module is needed to pick up the sheet from the placement position and send it to the heating module. When the sheet is gripped, there will be an interaction force between the sheet and the gripping module, especially for large sheets, the interaction force is particularly obvious. This will cause the sheet to be not in a horizontal position on the gripping module, or not parallel to the moving direction of the heating module, or both problems may exist. In this case, the position of the sheet will not correspond to the heating module, causing the local heating position of the sheet to be offset, or even the sensor of the heating module cannot be fitted onto the sheet. Summary of the Invention

[0004] The purpose of this invention is to provide a device for local heating and forming of large-size sheet metal, thereby solving the technical problems in related technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A large-size sheet metal local heating and forming device includes a heating module and a material gripping module. The material gripping module grips the sheet metal and moves it to the heating module for local heating. The device also includes a correction module connected to the heating module. The correction module includes a first correction branch and a second correction branch. When the heating module moves along the length of the sheet metal towards the position on the sheet metal to be heated, the first correction branch corrects the length of the sheet metal to be parallel to the moving direction of the heating module, and the second correction branch corrects the width of the sheet metal to be flush with the horizontal plane.

[0007] As described above, the first straightening branch includes a frame and a drive unit mounted on the frame. A set of bases is slidably arranged at each end of the frame along the width direction of the plate. Each set of bases consists of two bases arranged side by side in the vertical direction. Two straightening rods are arranged between each set of bases, and the four straightening rods are arranged in a square structure. The drive unit drives the two sets of bases to approach each other during their stroke. The four straightening rods press the two sides of the plate in the width direction so that the length direction of the plate is straightened to be parallel to the moving direction of the heating module.

[0008] As described above, the driving component includes a driving source, the output end of which is fixedly connected to the center of a shuttle-shaped rod, and each end of the shuttle-shaped rod is hinged to one end of a push-pull rod, the other end of which is hinged to one of the bases.

[0009] The second corrective branch described above includes multiple wedge blocks disposed on the frame, each wedge block corresponding to a base. The corrective rod is vertically slidably disposed on the base, and a fifth elastic element is connected between the corrective rod and the base in the sliding direction of the corrective rod. A pressure block is slidably disposed at each end of the corrective rod, and a sixth elastic element is connected between the pressure block and the corrective rod in the sliding direction of the pressure block. A pressure portion is provided on the side of the corrective rod facing the width direction of the plate. When the pressure portion is pressed by the side of the plate at different positions, the pressure block at the corresponding position extends out of the corrective rod and contacts the wedge surface of the wedge block. As the corrective rod presses the side of the plate, the wedge block exerts a pressing effect on the pressure block in contact with it, so that the corrective rod slides and drives the side of the plate to move vertically.

[0010] As described above, when the side of the plate comes into contact with the pressure-bearing part, the two slide relative to each other in the length direction.

[0011] As described above, the pressure-bearing section is vertically divided into an upper pressure section, a middle pressure section, and a lower pressure section. When the upper pressure section is pressed by the sheet metal, the pressure block located on the upper part of the straightening rod extends out and contacts the wedge-shaped surface of the wedge block. When the middle pressure section is pressed by the sheet metal, no pressure block extends out and contacts the wedge-shaped surface of the straightening rod. When the lower pressure section is pressed by the sheet metal, the pressure block located on the lower part of the straightening rod extends out and contacts the wedge-shaped surface of the wedge block.

[0012] The contact point between the pressure block and the wedge block described above is a spherical structure.

[0013] As mentioned above, the dimension between the two bases in each group is the same as the vertical dimension of the feed inlet on the heating module for the plate to enter; the dimension between the two corresponding straightening rods in the width direction of the plate is the same as the dimension of the feed inlet in the width direction of the plate.

[0014] As mentioned above, the dimension between two corresponding wedges along the length of the plate is the same as the width dimension of the plate.

[0015] As described above, the wedge block has a horizontal surface, and the horizontal surface has a limiting groove. During the stroke of the straightening plate, after the wedge surface on the wedge block moves, the pressure block enters the horizontal surface, and the pressure block is inserted into the limiting groove.

[0016] The beneficial effects of the present invention are as follows: before the plate is heated, the length direction of the plate is corrected to be parallel to the moving direction of the heating module by the first correcting branch, and the width direction of the plate is corrected to be flush with the horizontal plane by the second correcting branch. Then, the process of the sensor of the heating module and the plate being fitted together will proceed smoothly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the planar structure of the heating part of the metal sheet for which the robotic arm gripping mechanism provided by the present invention is applied;

[0019] Figure 2 A three-dimensional structural schematic diagram of the large-size sheet metal local heating and forming device provided by the present invention;

[0020] Figure 3 A three-dimensional structural diagram of the correction module of the large-size sheet metal local heating and forming device provided by the present invention;

[0021] Figure 4 A schematic diagram of the cross-sectional structure of the straightening rod in the large-size sheet metal local heating and forming device provided by the present invention;

[0022] Figure 5 A three-dimensional structural diagram of the material gripping module of the large-size sheet metal local heating and forming device provided by the present invention;

[0023] Figure 6 A schematic cross-sectional view of the material gripping module of the large-size sheet metal local heating and forming device provided by the present invention;

[0024] Figure 7 A cross-sectional schematic diagram of the first locking mechanism of the large-size sheet metal local heating and forming device provided by the present invention;

[0025] Figure 8A cross-sectional schematic diagram of the second locking mechanism of the large-size sheet metal local heating and forming device provided by the present invention;

[0026] Figure 9 A schematic diagram of the extrusion block structure of the large-size sheet metal local heating and forming device provided by the present invention;

[0027] Figure 10 This is a schematic diagram of the extrusion plate structure of the large-size sheet metal local heating forming device provided by the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Body; 2. Gripping module; 20. Base plate; 21. Middle gripper; 210. Front section; 211. Middle section; 212. Rear section; 213. Stopper; 214. Round block; 215. Extrusion port; 216. Extrusion rod; 217. Extrusion plate; 22. Side gripper; 23. Slide rail; 24. Slider; 25. Drive module; 26. First locking mechanism; 260. Locking rod; 261. Locking groove; 262. Groove blocking block; 263. Unlocking rod; 27. Auxiliary gripper; 28. Second locking mechanism; 280. First transmission rod; 281. First capsule; 282. Second capsule; 283. Second transmission rod; 284. Extrusion block; 285. Extrusion groove; 286. Shaft; 287. Spiral groove; 288. Sliding block; 3. Heating module; 4. Correction module; 40. Drive source; 41. Shuttle rod; 42. Push-pull rod; 43. Base; 44. Correction rod; 45. Wedge block; 46. Pressure block; 47. Pressure section; 470. Upper pressure section; 471. Middle pressure section; 472. Lower pressure section; 48. Limiting groove; 5. Plate; 50. Heating part. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figure 1 To be continued Figure 10 The present invention will now be described in further detail.

[0031] In this embodiment of the invention, a local heating and forming device for large-size sheet materials (such as sheet materials with a length greater than 1000mm and a width greater than 500mm) includes a heating module 3 and a material gripping module 2. The material gripping module 2 grips the sheet material and moves it to the heating module 3 for local heating. The device also includes a correction module 4 connected to the heating module 3. The correction module 4 includes a first correction branch and a second correction branch. When the heating module 3 moves along the length direction of the sheet material towards the position on the sheet material that needs to be heated, the first correction branch corrects the length direction of the sheet material to be parallel to the moving direction of the heating module 3, and the second correction branch corrects the width direction of the sheet material to be flush with the horizontal plane.

[0032] For ease of subsequent description and understanding, the length direction of the board is now defined as the first direction, and the width direction of the board is defined as the second direction.

[0033] Specifically, the material gripping module 2 grips the sheet material to be heated, driven by a robotic arm. This robotic arm is existing technology and will not be described in detail. The heating module 3 uses medium-frequency induction heating, which is also existing technology and will not be described in detail. This invention mainly targets localized heating of the sheet material, as shown in the attached diagram. Figure 1 As shown, the board has a rectangular structure, and its heating parts are biased towards the two ends of the board in the first direction. When the board is heated, the heating module 3 is driven to move in the first direction to the part of the board that needs to be heated. The robot arm drives the gripping module 2 to grip the board and move it in the first direction, so that the heating parts of the board can correspond to the heating module 3. The gripping module 2 grips the two sides of the board in the width direction without affecting the sensor of the heating module 3 being fitted onto the part of the board that needs to be heated.

[0034] When the board is gripped by the material gripping module 2, positional offset problems may occur, namely the following situations: Problem 1, the length direction of the board is not parallel to the moving direction of the heating module 3; Problem 2, the two ends of the board are uneven in the first direction; Problem 3, the two sides of the board are uneven in the second direction; Problem 4, the board has problems 1, 2 and 3 at the same time. All four of these problems will cause the position of the board to not correspond to that of the heating module 3, resulting in a local offset of the heating position of the board, or even the sensor of the heating module 3 cannot be fitted onto the board.

[0035] In this embodiment, by setting a first correction branch, the position of the plate can be corrected in the second direction so that its length direction is parallel to the moving direction of the heating module 3. By setting a second correction branch, the position of the plate can be corrected in both the first and second directions so that it is flush with the horizontal plane. If the above problems exist alone, only one of the first correction branch and the second correction branch needs to work. If two or more problems exist at the same time, the first correction branch and the second correction branch work together.

[0036] Preferably, the first straightening branch includes a frame and a drive unit mounted on the frame. A set of bases 43 is slidably arranged at each end along the width direction of the plate on the frame. Each set of bases 43 consists of two bases arranged side by side in the vertical direction. Two straightening rods 44 are arranged between each set of bases 43, and the four straightening rods 44 are arranged in a square structure. The drive unit is driven to move closer to each other during the stroke of the two sets of bases 43. The four straightening rods 44 press the two sides of the plate in the width direction so that the length direction of the plate is straightened to be parallel to the moving direction of the heating module 3. The drive unit includes a drive source 40. The output end of the drive source 40 is fixedly connected to the center of a shuttle-shaped rod 41. Each end of the shuttle-shaped rod 41 is hinged to one end of a push-pull rod 42. The other end of the push-pull rod 42 is hinged to one of the sets of bases 43.

[0037] Specifically, during the travel of the heating module 3 as it mounts the plate, the straightening module 4 first reaches the end of the plate in the first direction. Then, the heating module 3 stops moving, and the drive source 40 starts working. The drive source 40 drives the shuttle rod 41 connected to it to rotate. The rotation of the shuttle rod 41 generates a pulling force on the two push-pull rods 42 hinged to it, causing the two push-pull rods 42 to move closer to each other. Then, a set of bases 43 connected to each push-pull rod 42 will gradually move closer to the side of the plate in the second direction. The bases 43 drive the straightening rods 44 to contact the side of the plate. Since the four straightening rods 44 are arranged in a square structure, if the side of the plate cannot simultaneously contact the four straightening rods 44... If there is contact, it indicates that the plate is misaligned, meaning that the length direction of the plate is not parallel to the moving direction of the heating module 3. As a result, the two sets of bases 43 move closer to each other, and the four straightening rods 44 simultaneously press on both sides of the plate in the second direction until both sides of the plate are in contact with the straightening rods 44. At this point, the length direction of the plate will be parallel to the moving direction of the heating module 3. The drive source 40 drives the shuttle rod 41 to rotate in the opposite direction. The shuttle rod 41 drives the two push-pull rods 42 connected to it to move away from each other. The push-pull rods 42 will then drive the set of bases 43 connected to them to move away from the sides of the plate. The bases 43 will then drive the straightening rods 44 connected to them to move away from the sides of the plate.

[0038] Preferably, the second corrective branch includes a plurality of wedge blocks 45 disposed on the frame, each wedge block 45 corresponding to a base 43, the corrective rod 44 being vertically slidably disposed on the base 43, and a fifth elastic element being connected between the corrective rod 44 and the base 43 in the sliding direction of the corrective rod 44, a pressure block 46 being slidably disposed at each end of the corrective rod 44, and a sixth elastic element being connected between the pressure block 46 and the corrective rod 44 in the sliding direction of the pressure block 46, and a pressure portion 47 being provided on the side of the corrective rod 44 facing the width direction of the plate; when the pressure portion 47 is pressed by the side of the plate at different positions, the pressure block 46 at the corresponding position extends out of the corrective rod 44 and contacts the wedge surface of the wedge block 45, as the corrective rod 44 presses the side of the plate, the wedge block 45 exerts a pressing effect on the pressure block 46 in contact with it so that the corrective rod 44 slides and drives the side of the plate to move vertically.

[0039] Specifically, after the side of the plate contacts the straightening rod 44, if the plate is uneven at both ends on the first side or uneven on both sides on the second side, or both, the higher part of the plate will press against the upper part of the corresponding pressure portion 47, and the lower part of the plate will press against the lower part of the corresponding pressure portion 47. Thus, the upper part of the pressure portion 47 will exert force on the pressure block 46 located on the upper part of the straightening rod 44, causing the pressure block 46 to extend out of the upper end of the straightening rod 44 and contact the wedge-shaped surface of the corresponding wedge block 45. The lower part of the pressure portion 47 will exert force on the pressure block 46 located on the lower part of the straightening rod 44. The pressure block 46 generates force, causing the pressure block 46 to extend from the lower end of the straightening rod 44 and contact the wedge-shaped surface of the corresponding wedge block 45. Then, when the straightening rod 44 presses the side of the plate in the second direction, the wedge-shaped surface exerts a pressing effect on the pressure block 46 in contact with it, and the pressure part 47 is constantly pressed by the side of the plate. At this time, the straightening rod 44 and the pressure block 46 can be regarded as a whole. The whole is pressed by the wedge-shaped surface and will slide on the base 43 connected to it. Then the pressure part 47 will drive the side of the plate to move down or up to adjust the unevenness of the plate in the first or second direction.

[0040] That is, the straightening rod 44 can not only correct the problem that the length direction of the plate is not parallel to the moving direction of the heating module 3, but also correct the problem that the plate is uneven in the first direction and the second direction.

[0041] When the side of the plate comes into contact with the pressure-bearing part 47, the two slide relative to each other in the length direction so that the heating module 3 can move freely in the length direction, and the straightening rod 44 will not slide with the side of the plate when it moves vertically.

[0042] Furthermore, the pressure-bearing section 47 is vertically divided into an upper pressure section 470, a middle pressure section 471, and a lower pressure section 472. When the upper pressure section 470 is pressed by the sheet metal, the pressure block 46 located on the upper part of the straightening rod 44 extends out and contacts the wedge-shaped surface of the wedge block 45. When the middle pressure section 471 is pressed by the sheet metal, the pressure block 46 does not extend out of the straightening rod 44 and contacts the wedge-shaped surface of the wedge block 45. When the lower pressure section 472 is pressed by the sheet metal, the pressure block 46 located on the lower part of the straightening rod 44 extends out and contacts the wedge-shaped surface of the wedge block 45.

[0043] Specifically, there is a mutual squeezing action between the upper pressure section 470 and the pressure block 46 located on the upper part of the straightening rod 44. For example, the upper pressure section 470 is provided with a protrusion, and the pressure block 46 is provided with a wedge-shaped part. When the protrusion squeezes the wedge-shaped part, a thrust is generated on the wedge-shaped part to push the pressure block 46 out of the end of the straightening rod 44. The same is true between the lower pressure section 472 and the pressure block 46 located on the lower part of the straightening rod 44. The middle pressure section 471 is fixed to the straightening rod 44. That is, when the side of the plate contacts the middle pressure section 471, it means that the positional deviation of the plate is within an acceptable range, such as when the height difference between the two ends of the plate in the first direction and the height difference between the two sides in the second direction are both within 10cm.

[0044] When the pressure block 46 on the upper part of the straightening rod 44 contacts the wedge-shaped surface of the corresponding wedge block 45, as the straightening rod 44 gradually approaches the center line of the plate along the second direction, the wedge-shaped surface of the wedge block 45 exerts a downward squeezing force on the pressure block 46. When the pressure block 46 on the lower part of the straightening rod 44 contacts the wedge-shaped surface of the corresponding wedge block 45, as the straightening rod 44 gradually approaches the center line of the plate along the second direction, the wedge-shaped surface of the wedge block 45 exerts an upward squeezing force on the pressure block 46. In this way, the four straightening rods 44 at both ends of the plate length direction work together to adjust the unevenness of the plate.

[0045] The contact point between the pressure block 46 and the wedge block 45 is a spherical structure, which reduces the resistance generated when the pressure block 46 is squeezed by the wedge surface of the wedge block 45, so that the correction rod 44 can move smoothly along the second direction.

[0046] Furthermore, the dimension between the two bases 43 in each group is the same as the vertical dimension of the feed port on the heating module 3 for the plate to enter; the dimension between the two corresponding straightening rods 44 in the width direction of the plate is the same as the dimension of the feed port in the width direction of the plate.

[0047] Specifically, because the sensor of the heating module 3 is mounted on the board but the two do not contact each other, there is a reserved space between them. The dimensions between the two bases 43 in each group are the same as the vertical dimensions of the feed port on the heating module 3 for the board to enter, and the dimensions between the two corresponding straightening rods 44 in the width direction of the board are the same as the dimensions of the feed port in the width direction of the board. This makes it easy to determine whether the board can enter the feed port. If it cannot enter between the two bases 43 in each group or between the two straightening rods 44 in the width direction of the board, or if it cannot enter in either case, it means that the board position is offset. The robot arm needs to drive the gripping module 2 to move the board away from the heating module 3 for re-gripping.

[0048] The dimension between the two corresponding wedge blocks 45 in the length direction of the plate is the same as the width dimension of the plate. When the pressure block 46 finishes moving along the wedge surface of the wedge block 45, it indicates that the plate position correction is completed.

[0049] Furthermore, the wedge block 45 has a horizontal surface, and the horizontal surface has a limiting groove 48. During the stroke of correcting the position of the plate, the pressure block 46 enters the horizontal surface after the wedge surface on the wedge block 45 has finished moving, and the pressure block 46 is inserted into the limiting groove 48. Specifically, the side of the plate exerts a squeezing effect on the pressure part 47, and the pressure part 47 exerts a squeezing effect on the pressure block 46. Therefore, when the pressure block 46 is inserted into the limiting groove 48, the position of the correcting rod 44 can be restricted, so that the drive source 40 can be in a stopped state and does not restrict the movement of the correcting rod 44. This can protect the drive source 40 and ensure that the position of the plate after correction will not change again during the heating process.

[0050] The material gripping module 2 includes a gripping part disposed on the body 1, which grips both sides of the material in the width direction; during the stroke of the heating module 3 moving to the part of the material that needs to be heated, the gripping part is pushed away from the part of the material that needs to be heated by the heating module 3, and the gripping part increases the gripping force on the material based on the pushing of the heating module 3 so that the material forms prestress at the heating part.

[0051] Specifically, the robotic arm drives the material gripping module 2 to grasp the sheet material to be heated. The robotic arm mainly provides power for moving the sheet material and adjusting its position so that the heating module 3 can heat it. The robotic arm is existing technology and will not be described in detail. The heating module 3 uses medium-frequency induction heating, which is also existing technology and will not be described in detail. This invention mainly targets the local heating of the sheet material, as shown in the attached diagram. Figure 1As shown, the board has a rectangular structure, with its heating parts biased towards both ends of the board in the first direction. When the board is heated, the heating module 3 is driven to move in the first direction to the part of the board that needs to be heated. The robot arm drives the gripping module 2 to grip and move the board in the first direction, so that the heating part of the board can correspond to the heating module 3. Since the heating part of the board is heated, the gripping part mainly grips the two sides of the board in the second direction. When the heating module 3 heats the board, the gripping part removes its grip on the heating part of the board so that the heating module 3 can move smoothly to the part of the board that needs to be heated.

[0052] The clamping part 21 mainly holds the plate between the two heating parts. Since the plates targeted by this invention are all large in size, when the clamping part near the upper end of the plate in the first direction is removed, the end of the plate will swing down due to gravity. This will cause the plate to obstruct the movement of the heating module 3, making it impossible to perform local heating of the plate. Therefore, it is necessary to overcome the gravity on the end of the plate so that it can be kept as parallel as possible to the moving direction of the heating module 3.

[0053] In this embodiment, the clamping part needs to be pushed by the heating module 3 to remove its gripping of the heated part of the board. This ensures that the heating module 3 can be smoothly fitted onto the board from the beginning. Secondly, when the clamping part is pushed by the heating module 3, it can increase the clamping force on both sides of the board width direction based on the pushing force of the heating module 3, so that the board gradually becomes arc-shaped in the second direction. This arc shape can provide prestress to the end of the board to resist the gravity of the end of the board. Moreover, the curvature of the board increases as the distance the clamping part is pushed by the heating module 3 increases, thereby preventing the end of the board from swinging down in the first direction and affecting the heating effect.

[0054] In this embodiment, the heating module 3 pushes away the side grippers 22 that need to be heated on the plate during the movement process, which exposes the part of the plate that needs to be heated, so that the heating module 3 can move to this location to perform the heating function. When the side grippers 22 are pushed by the heating module 3, the side grippers 22 and the middle grippers 21 simultaneously increase the gripping force on the plate, that is, apply the extrusion force from both sides in the width direction of the plate, so that the plate forms an arc shape after being subjected to force on both sides. The arc shape can increase the prestress in the length direction of the plate to resist the gravity on the end of the plate, so the end of the plate is not easily affected by gravity and droops, thus making it easier for the sensor to be sleeved on the plate.

[0055] Preferably, the gripping module 2 further includes a base plate 20, which consists of two side sections and a central section connecting the two side sections. The gripping part consists of a side gripper 22 located in the side section and a central gripper 21 located in the central section. The central gripper 21 is used to grip the middle part of the plate, and the side gripper 22 is used to grip the width sides of the plate near the ends in the length direction. A slide rail 23 is provided on both sides of the width direction of the side section. A slider 24 is slidably provided in the slide rail 23 along the length direction of the plate. The side gripper 22 and the corresponding slider 24, as well as the central gripper 21 and the central section, are all connected by hinges, and a first elastic element is provided at each hinge. A driving module 25 is provided on the base plate 20. The driving module 25 drives the gripping part to overcome the elastic force of the first elastic element to form a gripping action on the plate.

[0056] Specifically, the structure of substrate 20 is similar to that of a plate to be heated, and substrate 20 and the plate are arranged vertically in sequence. When the plate is initially clamped, the central clamp 21 in the central area is responsible for clamping the plate at the middle position in the first direction, and the side clamps 22 in the side area are responsible for clamping the plate at the positions on both sides of the plate in the second direction near the end in the first direction (at this time, the side clamps 22 are also the positions closest to the end of the plate in the first direction). That is, both the central clamp 21 and the side clamps 22 apply clamping force to both sides of the plate in the second direction. The drive module 25 applies a driving force to the central clamp 21 and the side clamps 22, causing them to swing and overcome. The first elastic element (preferably a torsion spring, the specifications of which should be selected according to the specifications of the plate to ensure that when the driving module 25 removes the driving force of the center clamp 21 and the side clamp 22, the center clamp 21 and the side clamp 22 can smoothly remove their grip on the plate under the action of the spring's rebound force) forms a clamping action on the plate. Since the heating area of ​​the plate corresponds to the edge area on the substrate 20, the length dimension of the center area in the first direction should be as small as possible smaller than the length dimension of the edge area. This ensures that the plate can be clamped smoothly while freeing up more space for the heating area on the plate. When heating the heating area of ​​the plate... The edge gripper 22, located in the edge area, needs to move closer to the center area to expose the heating zone, thus not hindering the heating function of the heating module 3. Specifically, as the heating module 3 gradually moves closer to the heating zone of the board along the first direction, it first contacts the edge gripper 22. As the heating module 3 continues to move, the edge gripper 22 is pushed closer to the center gripper 21 in the center area. Simultaneously, the movement of the edge gripper 22 causes the connected slider 24 to slide within the slide rail 23. As the slider 24 gradually approaches the center gripper 21, the drive module 25 can gradually increase the driving force applied to the center gripper 21 and the edge gripper 22 based on this signal. The power increases the clamping force of the middle clamp 21 and the side clamp 22 on the plate in the second direction. When the plate is subjected to the extrusion force from the opposite direction on both sides in the second direction, the plate will tend to bend (bulge in the middle). The bent plate will provide prestress in the second direction, which will increase the bending strength of the plate in that direction. Thus, when the position of the side clamp 22 gradually approaches the middle clamp 21, the end of the plate in the first direction can be basically prevented from swinging down due to gravity. Therefore, the plate can also remain basically horizontal and straight in the first direction when heated, so that the heating can proceed smoothly.

[0057] Preferably, the central gripper 21 has a front section 210, a middle section 211, and a rear section 212 in sequence. The front section 210 is flat to facilitate gripping stacked plates. The middle section 211 of the central gripper 21 is hinged to the substrate 20. The rear section 212 of the central gripper 21 is driven by the driving module 25 to cause the central gripper 21 to deflect as a whole. A stop 213 is provided at the connection between the front section 210 and the middle section 211 of the central gripper 21 to prevent the movement of the plates. The side gripper 22 has the same structure as the central gripper 21.

[0058] Specifically, since the boards are basically stacked before heating, the existing technology usually uses a clamping mechanism with a suction cup structure to grip the stacked boards. However, in this embodiment, the boards need to be locally heated at high temperatures, and during the heating process, the middle clamp 21 and the side clamp 22 also need to hold the boards. Therefore, the clamping mechanism with a suction cup structure is not suitable for this embodiment. Therefore, in this embodiment, the front sections 210 of the middle clamp 21 and the side clamp 22 are flat so that they can be easily inserted into the gap between adjacent boards to grip the upper board. After the board is gripped, its two sides in the second direction will abut against the corresponding stops 213 on the middle clamp 21 and the side clamp 22. When the drive module 25 increases the driving force on the rear section 212, the stops 213 can prevent the sides of the board from sliding on the front section 210 and the middle section 211. In this way, the clamping force applied to the sides of the board by the middle clamp 21 and the side clamp 22 can be applied smoothly.

[0059] A circular block 214 is hinged at the stop 213. The circular block 214 has a pressing port 215. The sheet metal abuts against the pressing port 215. A pressing rod 216 is fixed to the circular block 214. A pressing plate 217 is hinged between two pressing rods 216 at opposite positions in the width direction of the sheet metal. The pressing plate 217 is an upward-opening arc shape. When the clamping force of the two center clamps 21 and two side clamps 22 at opposite positions in the width direction of the sheet metal increases, the sheet metal exerts a reaction force on the pressing block 284, causing the circular block 214 to rotate and cooperate with the front section 210 to press and clamp the edge portion of the sheet metal. The rotation of 14 will cause the extrusion rod 216 to exert extrusion force on both ends of the extrusion plate 217, which will increase the concave arc of the extrusion plate 217. The extrusion plate 217 will exert downward pressure on the middle of the plate, making the plate form an arc shape with the opening facing upward. In this way, when the middle clamp 21 and the side clamp 22 increase the clamping force on the edge of the plate, the edge of the plate can be more stably positioned at the extrusion port 215. The extrusion plate 217 directly applies pressure to the middle of the plate, preventing the plate from bending from the edge when the sides of the plate are subjected to extrusion force. If the plate bends from the edge under force, it cannot provide sufficient prestress to overcome the gravity at the end of the plate in the length direction.

[0060] The drive module 25 includes a hydraulic cylinder assembly disposed on the base plate 20 and a push rod installed at the output end of the hydraulic cylinder assembly. During the extension process, the hydraulic cylinder assembly simultaneously generates a thrust on the rear section 212 of the middle clamp 21 and the rear section 212 of the side clamp 22.

[0061] Furthermore, the slider 24 is connected to the substrate 20 in the sliding direction by a second elastic element, and the substrate 20 is provided with a detection module for detecting the moving distance of the slider 24. The driving module 25 adjusts the driving force applied to the gripper based on the detection signal of the detection module.

[0062] Specifically, when the aforementioned edge clamp 22 retracts from the heating area of ​​the board, it needs to be pushed by the heating module 3. The stroke of the heating module 3 around the edge of the board naturally squeezes the edge clamp 22. After the board heating is completed, the edge clamp 22 needs to be manually or mechanically reset. However, the board heating operation is continuous, and obviously, the reset method of the edge clamp 22 is not conducive to improving the efficiency of the board heating operation. Therefore, in this embodiment, when the edge clamp 22 is pushed by the heating module 3, the edge clamp 22 drives the slider 24 connected to it to move synchronously. The movement of the slider 24 squeezes the second elastic element, causing the second elastic element to... As the elastic force of the elastic element increases, after the heating module 3 is removed after the plate is heated, the slider 24 returns to its initial position under the rebound force of the second elastic element, that is, the side clamp 22 returns to its initial position. The closer the distance between the side clamp 22 and the middle clamp 21, the more the plate is not clamped in the first direction, and the greater the gravity will be, increasing the probability of swinging. Therefore, a detection module, such as a displacement sensor, is set to detect the movement distance of the slider 24. When the displacement distance of the slider 24 changes, the drive module 25 can control the driving force applied to the rear section 212 based on the detection signal of the displacement sensor.

[0063] Furthermore, the substrate 20 is provided with a first locking mechanism 26. When the side clamp 22, which is pushed by the heating module 3, moves to a certain position on the substrate 20, the slider 24 connected to the side clamp 22 is locked on the substrate 20 by the first locking mechanism 26. When the side clamp 22 removes its grip on the substrate, the first locking mechanism 26 releases the lock on the slider 24.

[0064] Specifically, after the heating module 3 removes the thrust of the edge clamp 22, the slider 24 will reset under the rebound force of the second elastic element. However, after the plate is heated, it needs to be sent to the press for extrusion molding immediately. At this time, the heated part of the plate is still at a high temperature. The edge clamp 22 will then hold the heated part of the plate and play a heat conduction role, directing the temperature of the plate to other components, such as the drive module 25. For large-sized plates, hydraulic cylinders are usually used for clamping. However, high temperature has an adverse effect on the use of hydraulic cylinders. Secondly, a part of the plate temperature is discharged, and there will be a temperature difference in the heated area. The temperature difference causes the hardness of the plate to change, which will also have an adverse effect on the subsequent extrusion molding.

[0065] Therefore, in this embodiment, to prevent the slider 24 from resetting under the rebound force of the second elastic element and causing the side clamp 22 to hold the heated part of the plate, when the side clamp 22 is pushed to a certain position by the heating module 3 and stops, the first locking mechanism 26 will immediately lock the slider 24 connected to the side clamp 22. After the plate is heated, the heating module 3 returns to the initial position, and the side clamp 22, which loses the pushing force of the heating module 3, will not reset. Afterwards, when the body 1 moves the clamping part to the press and removes the clamping of the plate, the first locking mechanism 26 will release the lock on the position of the slider 24, so that the slider 24 drives the side clamp 22 connected to it to reset under the rebound force of the second elastic element.

[0066] Preferably, the first locking mechanism 26 includes a locking rod 260 hinged to the slider 24, with a third elastic element (preferably a torsion spring) at the hinge point. The base plate 20 has multiple locking grooves 261 arranged in parallel along its length. A blocking block 262 is slidably inserted into each locking groove 261. The multiple blocking blocks 262 are connected by an unlocking rod 263, which is slidably disposed on the base plate 20. A fourth elastic element is connected between the unlocking rod 263 and the base plate 20 in the sliding direction of the unlocking rod 263. When the driving module 25 does not apply driving force to the center clamp 21 and the side clamp 22 to form a clamping action on the plate, the unlocking rod 263 is based on the center clamp... The squeezing action of 21 causes the blocking block to completely block the locking groove 261. When the driving module 25 applies driving force to the middle clamp 21 and the side clamp 22 to form a clamping action on the plate, the middle clamp 21 removes the squeezing action on the unlocking rod 263. The unlocking rod 263 causes the blocking block 262 to disengage from the locking groove 261. The locking groove 261 has an opening on the side away from the blocking block 262, and the opening faces the side where the locking rod 260 is located. Therefore, when the blocking block 262 disengages from the locking groove 261, the locking rod 260 can be inserted into the locking groove 261, so that the slider 24 connected to the locking rod 260 cannot move under the action of the second elastic member's rebound force.

[0067] Specifically, during the extension of the hydraulic cylinder assembly, the push rod drives the rear section 212 of the center clamp 21 and the rear section 212 of the side clamp 22 to generate thrust to form a clamping action stroke on the plate. When the pressure of the rear section 212 of the center clamp 21 on the unlocking rod 263 is removed, the unlocking rod 263, under the rebound force of the fourth elastic element, causes the connected blocking block 262 to gradually disengage from the locking groove 261. Thus, the side of the locking groove 261 facing the slider 24 is exposed. As the slider 24 approaches the center clamp 21, the locking rod 260 cannot engage with any locking groove 261. That is, the locking rod 260 is tilted on the slider 24, and its swing angle can only swing from the tilted position to the vertical position. When the slider... When slider 24 approaches the central clamp 21 along the first direction, it is squeezed by the wall of slide rail 23. The locking rod 260 cannot swing to a vertical state under the elastic force of the third elastic element and engage with any locking groove 261. After slider 24 stops moving, the locking groove 261 is exposed. Under the elastic force of the third elastic element, the locking rod 260 will stand up and be in a vertical state to engage with the corresponding locking groove 261. When slider 24 moves in the opposite direction under the rebound force of the second elastic element, since the locking rod 260 can no longer swing towards the central clamp 21, the locking rod 260 and the locking groove 261 engaged with it cooperate to prevent slider 24 from moving away from the central clamp 21, thereby achieving position locking of slider 24.

[0068] During the shortening process of the hydraulic cylinder assembly, as the push rod moves away from the rear section 212 of the center clamp 21 and the rear section 212 of the side clamp 22, both the center clamp 21 and the side clamp 22 will gradually release their grip on the plate under the action of the rebound force of their respective connected first elastic elements. The rear section 212 of the center clamp 21 will also exert a squeezing effect on the unlocking rod 263. Then, the locking rod 260 will drive the plug block 262 connected to it to insert into the locking groove 261, pushing out the locking rod 260 that is inserted into one of the locking grooves 261. In this way, the locking of the slider 24 is released. Under the action of the rebound force of the second elastic element, the slider 24 will reset with the side clamp 22 connected to it.

[0069] Furthermore, the clamping part also includes an auxiliary clamp 27 hinged to each of the substrate 20 in the width direction. After the plate is heated, the two auxiliary clamps 27 clamp the plate from the width direction.

[0070] Specifically, after the plate is heated, the heated part softens. The increased clamping force from the center gripper 21 and side grippers 22 may cause the plate to bend and generate upward stress, potentially making it unable to withstand the weight of the plate's ends. Therefore, to prevent this, after the heating module 3 retracts from the plate, the two auxiliary grippers 27 can clamp both ends of the plate in the first direction. This provides support at both ends in the first direction and on both sides in the second direction, reducing the probability of the aforementioned problem. The auxiliary grippers 27 can be driven using a hydraulic cylinder assembly. This invention also provides another driving method:

[0071] That is, a second locking mechanism 28 is provided on the substrate 20. When the side gripper 22 is not pushed by the heating module 3, the second locking mechanism 28 locks the auxiliary gripper 27 based on the squeezing action of the slider 24 connected to the side gripper 22. When the side gripper 22 is pushed by the heating module 3, the slider 24 moves with the side gripper 22 connected to it, and the second locking mechanism 28 releases the lock on the auxiliary gripper 27 based on the pulling force of the slider 24.

[0072] Specifically, when the side gripper 22 is in its initial position, the second locking mechanism 28 locks the auxiliary gripper 27. At this time, the position of the auxiliary gripper 27 will not affect the sensor of the heating module 3 covering the plate. When the heating module 3 pushes the side gripper 22 to move, the side gripper 22 will exert a pulling force on the second locking mechanism 28, causing it to unlock the auxiliary gripper 27. Thus, during the stroke of the side gripper 22 forming the clamping action, it will first contact the outer wall of the heating module 3, that is, the upper surface of the outer wall of the heating module 3, and will not affect the movement of the heating module 3. After the heating module 3 completes the heating operation, it will retract from the plate, and the slider 24... When locked by the first locking mechanism 26, the side gripper 22 will not reset, and the auxiliary gripper 27 will remain unlocked. After the auxiliary gripper 27 disengages from the outer surface of the heating module 3, it will clamp the end of the plate in the first direction. After the heated plate is transferred to the press, both the middle gripper 21 and the side gripper 22 will release their grip on the plate, and the first locking mechanism 26 will also release the lock on the slider 24. The side gripper 22 will then reset and provide a push to the second locking mechanism 28, causing the second locking mechanism 28 to deflect the auxiliary gripper 27 to release its grip on the end of the plate and return it to its initial position.

[0073] Preferably, the second locking mechanism 28 includes a first transmission rod 280 inserted into the slider 24 and a shaft 286 rotatably connected to the auxiliary gripper 27. The first transmission rod 280 is slidably disposed along the length direction of the substrate 20. When the sliding of the first transmission rod 280 is restricted, the slider 24 disengages from the first transmission rod 280. That is, a first bladder 281 and a second bladder 282 are provided at the end of the first transmission rod 280 where it is inserted into the slider 24. The first bladder 281 restricts the movement of the slider 24 and the first transmission rod 280. The separation between the first drive rod 280 and the second capsule 282 restricts the sliding of the first drive rod 280 on the substrate 20. The volume of the first capsule 281 is larger than that of the second capsule 282, so that the separation degree between the first drive rod 280 and the slider 24 is greater than the separation degree between the first drive rod 280 and the substrate 20. A fifth elastic element is connected between the auxiliary gripper 27 and the shaft 286. A plurality of second drive rods 283 are provided on the substrate 20 along its width direction. Each slider 24 corresponds to one second drive rod 283. The moving rod 283 drives the shaft 286 to rotate based on the movement of the first transmission rod 280. Specifically, the first transmission rod 280 is equipped with an extrusion block 284, and the second transmission rod 283 is equipped with an extrusion groove 285. The extrusion block 284 moves with the first transmission rod 280 and extrudes the wall of the extrusion groove 285. The extrusion block 284 extrudes the wall of the extrusion groove 285 in both forward and reverse directions along the length of the sheet material, and the extrusion directions are different. The shaft 286 is equipped with a spiral groove 287, and a sliding block 287 is slidably mounted within the spiral groove 287. 88. The second transmission rod 283 is fixedly connected to the sliding block 288. The sliding block 288 moves linearly following the second transmission rod 283. When the sliding block 288 moves, it slides in the spiral groove 287, which drives the shaft 286 to rotate. When the rotation of the auxiliary clamp 27 is restricted by the heating module 3, the rotation of the shaft 286 drives the fifth elastic element (preferably a torsion spring) to accumulate elastic potential energy. When the rotation of the auxiliary clamp 27 is not restricted by the heating module 3, the fifth elastic element releases elastic potential energy, which drives the auxiliary clamp 27 to form a clamping action on the plate.

[0074] Specifically, when the heating module 3 does not push the side gripper 22 to move, the squeezing block 284 applies squeezing force to the second transmission rod 283, making the distance between the sliding block 288 and the auxiliary gripper 27 in the second direction the closest. At this time, the two auxiliary grippers 27 are in a fully open state, so they will not affect the movement of the heating module 3.

[0075] When the heating module 3 pushes the side gripper 22 to move, the side gripper 22 drives the connected slider 24 to move. The movement of the slider 24 drives the first transmission rod 280 to move. When the first transmission rod 280 moves, it drives the connected pressing block 284 to exert a pressing effect on the second transmission rod 283. At this time, the second transmission rod 283 is pressed away from the auxiliary gripper 27. That is, the second transmission rod 283 drives the connected sliding block 288 to move away from the auxiliary gripper 27 in the second direction. Thus, the movement of the sliding block 288 exerts pressure on the inner wall of the spiral groove 287. Since the sliding block 288 moves linearly, the spiral groove 287 needs to match the sliding movement mode, which will cause the shaft 286 to rotate. The rotation of the shaft 286 drives the auxiliary gripper 27 to rotate together through the fifth elastic element. However, at this time, the heating module 3 is already pushing the side gripper 22 to move, so the auxiliary gripper 27 will still be hindered by the heating module 3 after it rotates. Thus, the rotation of the shaft 286 drives the fifth elastic element to accumulate elastic potential energy. After the movement is restricted by the substrate 20, meaning the first transmission rod 280 can no longer move with the slider 24, the first capsule 281 will disengage from the slider 24. The second capsule 282 disengages from the substrate 20 as soon as the first transmission rod 280 begins to move. Furthermore, the disengagement of the second capsule 282 from the substrate 20 hinders the resetting of the first transmission rod 280. Because the rotation of the auxiliary gripper 27 is restricted by the heating module 3, the rebound force of the fifth elastic element tends to cause the shaft 286 to reverse. The transfer causes the sliding block 288 to move in the opposite direction along the spiral groove 287, which in turn drives the second transmission rod 283 to exert a squeezing force on the pressing block 284, causing the pressing block 284 to drive the first transmission rod 280 to reset. However, due to the obstruction of the second bladder 282, the above process cannot be realized, thus causing the fifth elastic element to accumulate elastic potential energy. After the heating module 3 retracts from the plate, the rotation of the auxiliary clamp 27 is no longer restricted by the heating module 3, and it will form a clamping action on the end of the plate under the action of the release of the elastic potential energy of the fifth elastic element.

[0076] After the sheet metal is transferred to the press, the drive module 25 removes the driving force from the center clamp 21 and the side clamp 22. The center clamp 21 and the side clamp 22 will then release their grip on the sheet metal under the rebound force of their respective connected first elastic elements. In this way, the first locking mechanism 26 will also release the lock on the slider 24. The slider 24 will reset under the rebound force of the second elastic element. During the reset process, it will exert a squeezing effect on the end of the first transmission rod 280, causing the first transmission rod 280 to drive the connected squeezing block 284 to squeeze the second transmission rod 283. The second transmission rod 283 will be squeezed and move towards the auxiliary clamp 27. The sliding block 288 will be driven to gradually approach the auxiliary clamp 27 in the spiral groove 287. The shaft 286 rotates and drives the auxiliary clamp 27 to move in the opposite direction through the fifth elastic element to release its grip on the sheet metal.

[0077] The structural features of the extrusion block 284 must satisfy the requirement that it can generate an extrusion force in the opposite direction on the second transmission rod 283 when it moves back and forth in the first direction. For example, the extrusion block 284 is provided with two wedge-shaped surfaces, which are arranged symmetrically about the center point of the extrusion block 284.

[0078] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A large-size sheet metal local heating and forming device, comprising a heating module and a material gripping module, wherein the material gripping module grips the sheet metal and transfers it to the heating module for local heating, characterized in that, It also includes a correction module connected to the heating module, the correction module including a first correction branch and a second correction branch; As the heating module travels along the length of the plate towards the position on the plate that needs to be heated, the first straightening branch straightens the length direction of the plate to be parallel to the moving direction of the heating module, and the second straightening branch straightens the width direction of the plate to be flush with the horizontal plane. The first straightening branch includes a frame and a drive unit mounted on the frame. A set of bases is slidably arranged at each end of the frame along the width direction of the plate. Each set of bases consists of two bases arranged side by side in the vertical direction. Two straightening rods are arranged between each set of bases, and the four straightening rods are arranged in a square structure. The drive unit drives the two sets of bases to move closer to each other during the stroke. The four straightening rods squeeze both sides of the plate in the width direction so that the length direction of the plate is straightened to be parallel to the moving direction of the heating module. The second straightening branch includes multiple wedge blocks disposed on the frame, each wedge block corresponding to a base. The straightening rod is vertically slidably disposed on the base, and a fifth elastic element is connected between the straightening rod and the base in the sliding direction of the straightening rod. A pressure block is slidably disposed at each end of the straightening rod, and a sixth elastic element is connected between the pressure block and the straightening rod in the sliding direction of the pressure block. A pressure portion is provided on the side of the straightening rod facing the width direction of the plate. When the pressure portion is squeezed by the side of the plate at different positions, the pressure block at the corresponding position extends out of the straightening rod and contacts the wedge surface of the wedge block. As the straightening rod squeezes the side of the plate, the wedge block exerts a squeezing effect on the pressure block in contact with it, so that the straightening rod slides and drives the side of the plate to move vertically. The pressure-bearing section is vertically divided into an upper pressure section, a middle pressure section, and a lower pressure section. When the upper pressure section is pressed by the sheet metal, the pressure block located on the upper part of the straightening rod extends out and contacts the wedge-shaped surface of the wedge block. When the middle pressure section is pressed by the sheet metal, no pressure block extends out and contacts the wedge-shaped surface of the wedge block. When the lower pressure section is pressed by the sheet metal, the pressure block located on the lower part of the straightening rod extends out and contacts the wedge-shaped surface of the wedge block. The contact point between the pressure block and the wedge block is a spherical structure. The dimension between two corresponding wedges along the length of the plate is the same as the width of the plate. The material gripping module includes a clamping part on the main body, which grips both sides of the material in the width direction. The module also includes a base plate, which consists of two side sections and a central section connecting the two side sections. The clamping part comprises side clamps in the side sections and a central clamp in the central section. The central clamp is used to clamp the middle part of the material, and the side clamps are used to clamp the two sides of the material near their length ends. The central clamp has a front section, a middle section, and a rear section, with the front section being flat. The clamp is flat to facilitate gripping stacked plates. The middle section of the clamp is hinged to the substrate. The rear section of the clamp is driven by the drive module to deflect the entire clamp. A stop is provided at the connection between the front and middle sections of the clamp to prevent the plate from moving. A circular block is hinged at the stop. The circular block has a pressing port. The plate abuts against the pressing port. A pressing rod is fixed to the circular block. A pressing plate is hinged between two pressing rods at opposite positions in the width direction of the plate. The pressing plate is an arc shape with the opening facing upward.

2. The large-size sheet metal local heating and forming device according to claim 1, characterized in that, The driving component includes a driving source, the output end of which is fixedly connected to the center of a shuttle-shaped rod, and each end of the shuttle-shaped rod is hinged to one end of a push-pull rod, the other end of which is hinged to one of the bases.

3. The large-size sheet metal local heating and forming device according to claim 1, characterized in that, When the side of the plate comes into contact with the pressure-bearing part, the two slide relative to each other in the length direction.

4. The large-size sheet metal local heating and forming device according to claim 1, characterized in that, The dimension between the two bases in each group is the same as the vertical dimension of the feed port on the heating module for the plate to enter; The dimension between two corresponding straightening rods in the width direction of the plate is the same as the dimension of the feed port in the width direction of the plate.

5. The large-size sheet metal local heating and forming device according to claim 1, characterized in that, The wedge block has a horizontal surface, and the horizontal surface has a limiting groove. During the stroke of the straightening plate, after the wedge surface on the wedge block moves, the pressure block enters the horizontal surface, and the pressure block is inserted into the limiting groove.

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